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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_BASE32_H
#define ISC_BASE32_H 1
/*! \file */
/*
* Routines for manipulating base 32 and base 32 hex encoded data.
* Based on RFC 4648.
*
* Base 32 hex preserves the sort order of data when it is encoded /
* decoded.
*
* Base 32 hex "np" is base 32 hex but no padding is produced or accepted.
*/
#include <isc/lang.h>
#include <isc/types.h>
ISC_LANG_BEGINDECLS
/***
*** Functions
***/
isc_result_t
isc_base32_totext(isc_region_t *source, int wordlength,
const char *wordbreak, isc_buffer_t *target);
isc_result_t
isc_base32hex_totext(isc_region_t *source, int wordlength,
const char *wordbreak, isc_buffer_t *target);
isc_result_t
isc_base32hexnp_totext(isc_region_t *source, int wordlength,
const char *wordbreak, isc_buffer_t *target);
/*!<
* \brief Convert data into base32 encoded text.
*
* Notes:
*\li The base32 encoded text in 'target' will be divided into
* words of at most 'wordlength' characters, separated by
* the 'wordbreak' string. No parentheses will surround
* the text.
*
* Requires:
*\li 'source' is a region containing binary data
*\li 'target' is a text buffer containing available space
*\li 'wordbreak' points to a null-terminated string of
* zero or more whitespace characters
*
* Ensures:
*\li target will contain the base32 encoded version of the data
* in source. The 'used' pointer in target will be advanced as
* necessary.
*/
isc_result_t
isc_base32_decodestring(const char *cstr, isc_buffer_t *target);
isc_result_t
isc_base32hex_decodestring(const char *cstr, isc_buffer_t *target);
isc_result_t
isc_base32hexnp_decodestring(const char *cstr, isc_buffer_t *target);
/*!<
* \brief Decode a null-terminated string in base32, base32hex, or
* base32hex non-padded.
*
* Requires:
*\li 'cstr' is non-null.
*\li 'target' is a valid buffer.
*
* Returns:
*\li #ISC_R_SUCCESS -- the entire decoded representation of 'cstring'
* fit in 'target'.
*\li #ISC_R_BADBASE32 -- 'cstr' is not a valid base32 encoding.
*
* Other error returns are any possible error code from:
*\li isc_lex_create(),
*\li isc_lex_openbuffer(),
*\li isc_base32_tobuffer().
*/
isc_result_t
isc_base32_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length);
isc_result_t
isc_base32hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length);
isc_result_t
isc_base32hexnp_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length);
/*!<
* \brief Convert text encoded in base32, base32hex, or base32hex
* non-padded from a lexer context into data.
*
* Requires:
*\li 'lex' is a valid lexer context
*\li 'target' is a buffer containing binary data
*\li 'length' is an integer
*
* Ensures:
*\li target will contain the data represented by the base32 encoded
* string parsed by the lexer. No more than length bytes will be read,
* if length is positive. The 'used' pointer in target will be
* advanced as necessary.
*/
isc_result_t
isc_base32_decoderegion(isc_region_t *source, isc_buffer_t *target);
isc_result_t
isc_base32hex_decoderegion(isc_region_t *source, isc_buffer_t *target);
isc_result_t
isc_base32hexnp_decoderegion(isc_region_t *source, isc_buffer_t *target);
/*!<
* \brief Decode a packed (no white space permitted) region in
* base32, base32hex or base32hex non-padded.
*
* Requires:
*\li 'source' is a valid region.
*\li 'target' is a valid buffer.
*
* Returns:
*\li #ISC_R_SUCCESS -- the entire decoded representation of 'cstring'
* fit in 'target'.
*\li #ISC_R_BADBASE32 -- 'source' is not a valid base32 encoding.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_BASE32_H */